Re: [Wrapper-user] ClassNotFoundException with WrapperSimpleApp

[Leif M. <lei...@ta...>]

Lin,
I am sorry for the very slow reply.  We somehow missed that this mail was
stuck in moderation.

I think this is a problem with your working directory.   Remember that when
the Wrapper runs, it ALWAYS forces the current working directory to be the
location of the wrapper binary.
This is done so that the Wrapper runs consistently regardless of how the
Wrapper is launched.
In your case, when running with the Wrapper, the working directory is:
/Users/lin/git/exabeam/martini/java-wrapper/bin

I am not 100% sure what it is when you are running directly with your
command line.
In both cases, your classpath looks like this:
../lib/martini.jar:../lib/wrapper.jar

In the case of running with the Wrapper, this would mean that these files
are both located in the following directory:
/Users/lin/git/exabeam/martini/java-wrapper/lib

A couple things that are confusing to me:

1) If the jar files had not been found, you would be seeing a message like
the following in the logs just before the JVM is launched:
DEBUG  | wrapper  | 2014/09/01 16:02:40.255 |          | Classpath element,
wrapper.java.classpath.3, does not exist: ../lib/foo.jar
DEBUG  | wrapper  | 2014/09/01 16:02:40.255 |          | Classpath element,
wrapper.java.classpath.4, does not exist: ../xxx/bar.jar
The lack of these messages in the log makes it look like both files exist

2) How are you launching the Wrapper?  Is this on system startup?  The
working directory of the parent that launched the Wrapper was the root
directory:
DEBUG  | wrapper  | 2014/08/18 22:06:42 |   P--W- | WRAPPER_INIT_DIR=/
This should not matter as the working directory was correctly changed to
the location of the Wrapper binary:
DEBUG  | wrapper  | 2014/08/18 22:06:42 |   ---W- |
WRAPPER_WORKING_DIR=/Users/lin/git/exabeam/martini/java-wrapper/bin

In both cases, the WrapperSimpleApp class is being located and loaded
correctly.  That class simply locates the "com.exabeam.martini.Martini"
class by name in the same ClassLoader without doing anything special.

If none of these hints help, would it be possible to get a tar of your
application sent to su...@ta...?  We should only need the
martini.jar to be able to see if it locates your main class.  But I am also
interested in seeing the relative location of files.

Cheers,
Leif






On Tue, Aug 19, 2014 at 2:13 PM, Lin Zhao <li...@ex...> wrote:

> My previous post didn't get through so I'm reposting.
>
> I've been trying to use WrapperSimpleApp and have a ClassNotFoundException
> that I can't explain.
>
> The .conf has the jar that includes the main class, and you can see from
> the wrapper debug log that it's included to -classpath. But the wrapper
> fails to find it.
>
> Attaching the wrapper debug log.
>
> In the log, you can see:
>
> *DEBUG  | wrapper  | 2014/08/18 15:19:08 |   Command[7] :
> ../lib/martini.jar:../lib/wrapper.jar*
>
> martini.jar has  com.exabeam.martini.Martini, yet the wrapper can't find
> it.
>
> *INFO   | jvm 1    | 2014/08/18 15:19:08 | WrapperSimpleApp Error: Unable
> to locate the class com.exabeam.martini.Martini :
> java.lang.ClassNotFoundException: com.exabeam.martini.Martini*
> When the wrapper repeatedly retries, I captured the task command (via ps)
> as:
>
>  *501 44180 44168   0  9:57PM ttys008    0:00.47 /usr/bin/java -d64
> -Dlog4j.configuration=file:///Users/lin/git/exabeam/martini/src/main/resources/log4j.properties
> -Dspark.cleaner.ttl=300 -Xmx14000m -Djava.library.path=../lib -classpath
> ../lib/martini.jar:../lib/wrapper.jar -Dwrapper.key=JXisZluSb14SpUBv
> -Dwrapper.port=32000 -Dwrapper.jvm.port.min=31000
> -Dwrapper.jvm.port.max=31999 -Dwrapper.debug=TRUE -Dwrapper.pid=44168
> -Dwrapper.version=3.5.25 -Dwrapper.native_library=wrapper
> -Dwrapper.arch=universal -Dwrapper.cpu.timeout=10 -Dwrapper.jvmid=3
> org.tanukisoftware.wrapper.WrapperSimpleApp com.exabeam.martini.Martini
> /Users/lin/git/exabeam/martini/config/custom/exabeam_config_imperva.conf*
>
> If I run below command directly, WrapperSimpleApp is able to find and
> launch my main method, after which it failed for application specific
> reason.
>
> *java -classpath ../lib/martini.jar:../lib/wrapper.jar
> org.tanukisoftware.wrapper.WrapperSimpleApp com.exabeam.martini.Martini
> /Users/lin/git/exabeam/martini/config/custom/exabeam_config_imperva.conf*
>
> Output:
>
> *WrapperManager: Initializing...*
>
> *WrapperManager: WARNING - The version of the Wrapper which launched this
> JVM is*
>
> *WrapperManager:           "unknown" while the version of the native
> library*
>
> *WrapperManager:           is "3.5.25".*
>
> *WrapperManager:           The Wrapper may appear to work correctly but
> some features may*
>
> *WrapperManager:           not function correctly.  This configuration has
> not been tested*
>
> *WrapperManager:           and is not supported.*
>
> *WrapperManager: *
>
> *2014-08-18 22:00:11.924 INFO  ************************
>
> *2014-08-18 22:00:11.925 INFO    Martini started.*
> Attaching the log and the conf. Thanks for the help.
>
>